Added some utility methods

To retrieve the timestep and to retrieve the periodicity

src/Action.cpp

@@ -95,6 +95,10 @@ double Action::getTime()const{
   return plumed.getAtoms().getTimeStep()*getStep();
 }
 
+double Action::getTimeStep()const{
+  return plumed.getAtoms().getTimeStep();
+}
+
 
 
 void Action::exit(int c){

src/Action.h

@@ -75,6 +75,9 @@ protected:
 /// Return the present time
   double getTime()const;
 
+/// Return the timestep
+  double getTimeStep()const;
+
 /// Check if Action was properly read.
 /// This checks if Action::line is empty. It must be called after
 /// a final Action has been initialized

src/Value.cpp

@@ -13,6 +13,16 @@ Value::Value(ActionWithValue&action,const std::string& name):
   max(0.0)
 {}
 
+bool Value::isPeriodic()const{
+  assert(periodicity!=unset);
+  return periodicity==periodic;
+}
+
+void Value::getDomain(double&min,double&max)const{
+  min=this->min;
+  max=this->max;
+}
+
 void Value::setPeriodicity(bool p){
   if(p) periodicity=periodic;
   else periodicity=notperiodic;

src/Value.h

@@ -31,6 +31,8 @@ public:
   double get()const;
   void setPeriodicity(bool);
   void setDomain(double,double);
+  bool isPeriodic()const;
+  void getDomain(double&,double&)const;
   const std::string& getName()const;
   const std::string getFullName()const;
   void enableDerivatives();